Export From JSON

Installation

1yarn add export-from-json

or

1npm i --save export-from-json

or

1pnpm i --save export-from-json

Usage

exportFromJSON supports CommonJS, EcmaScript Module, UMD importing.

exportFromJSON receives the option as the Types Chapter demonstrated, and it uses a front-end downloader as the default processor. In browser environment, there is a content size limitation on the default processor, consider using the server side solution.

In module system

1import exportFromJSON from 'export-from-json'
2
3const data = [{ foo: 'foo'}, { bar: 'bar' }]
4const fileName = 'download'
5const exportType =  exportFromJSON.types.csv
6
7exportFromJSON({ data, fileName, exportType })

In browser

Check the codepen example

1<script src="https://unpkg.com/export-from-json/dist/umd/index.min.js"></script>
2<script>
3    const data = [{ foo: 'foo'}, { bar: 'bar' }]
4    const fileName = 'download'
5    const exportType = 'csv'
6
7    window.exportFromJSON({ data, fileName, exportType })
8</script>

In Node.js server

exportFromJSON returns what the option processor returns, we can use it on server side for providing a converting/downloading service:

1const http = require('http')
2const exportFromJSON = require('export-from-json')
3
4http.createServer(function (request, response){
5    // exportFromJSON actually supports passing JSON as the data option. It's very common that reading it from http request directly.
6    const data = '[{"foo":"foo"},{"bar":"bar"}]'
7    const fileName = 'download'
8    const exportType = 'txt'
9
10    const result = exportFromJSON({
11        data,
12        fileName,
13        exportType,
14        processor (content, type, fileName) {
15            switch (type) {
16                case 'txt':
17                    response.setHeader('Content-Type', 'text/plain')
18                    break
19                case 'css':
20                    response.setHeader('Content-Type', 'text/css')
21                    break
22                case 'html':
23                    response.setHeader('Content-Type', 'text/html')
24                    break
25                case 'json':
26                    response.setHeader('Content-Type', 'text/plain')
27                    break
28                case 'csv':
29                    response.setHeader('Content-Type', 'text/csv')
30                    break
31                case 'xls':
32                    response.setHeader('Content-Type', 'application/vnd.ms-excel')
33                    break
34            }
35            response.setHeader('Content-disposition', 'attachment;filename=' + fileName)
36            return content
37        }
38    })
39
40    response.write(result)
41    response.end()
42}).listen(8080, '127.0.0.1')

Types

Note: JSON refers to a parsable JSON string or a serializable JavaScript object.

Option name	Required	Type	Description
data	true	Array<JSON>, JSON or string	If the exportType is 'json', data can be any parsable JSON. If the exportType is 'csv' or 'xls', data can only be an array of parsable JSON. If the exportType is 'txt', 'css', 'html', the data must be a string type.
fileName	false	string	filename without extension, default to 'download'
extension	false	string	filename extension, by default it takes the exportType
fileNameFormatter	false	(name: string) => string	filename formatter, by default the file name will be formatted to snake case
fields	false	string[] or field name mapper type Record<string, string>	fields filter, also supports mapper field name by passing an name mapper, e.g. { 'bar': 'baz' }, default to undefined
exportType	false	Enum ExportType	'txt'(default), 'css', 'html', 'json', 'csv', 'xls', 'xml'
processor	false	(content: string, type: ExportType, fileName: string) => any	default to a front-end downloader
withBOM	false	boolean	Add BOM(byte order mark) meta to CSV file. BOM is expected by Excel when reading UTF8 CSV file. It is default to false.
beforeTableEncode	false	(entries: { fieldName: string, fieldValues: string[] }[]) => { fieldName: string, fieldValues: string[] }[]	Given a chance to altering table entries, only works for CSV and XLS file, by default no altering.
delimiter	false	',' | ';'	Specify CSV raw data's delimiter between values. It is default to ,

Tips

• You can reference these exported types through a mounted static field types, e.g.

1exportFromJSON({ data: jsonData, fileName: 'data', exportType: exportFromJSON.types.csv })

• You can transform the data before exporting by beforeTableEncode, e.g.

1exportFromJSON({
2    data: jsonData,
3    fileName: 'data',
4    exportType: exportFromJSON.types.csv,
5    beforeTableEncode: rows => rows.sort((p, c) => p.fieldName.localeCompare(c.fieldName)),
6})